Unified plugin to ignore unrelated messages. Currently works in PRs on Travis.

When working with natural language, having tools that check cumbersome tasks can be very useful (think alex or retext plugins). However, natural language isn’t as strict as code. Integrating natural language checking in a CI often doesn’t work well due to false positives. It’s possible to add a long list of exceptions, but this soon becomes unmanageable.

This plugin solves that problem, when in Travis, by ignoring any messages on unchanged lines. When run outside Travis, this plugin doesn’t do anything.

• Add support for other CIs (ping if you want to work on this);
• Add non-CI support (I’m not yet sure how though).

npm:

npm install unified-diff

Say we have this readme.md. Note the an an.

This is an an example.

Then, someone creates a PR which adds the following diff:

diff --git a/readme.md b/readme.md
index 360b225..5a96b86 100644
--- a/readme.md
+++ b/readme.md
@@ -1 +1,3 @@
 This is an an example.
+
+Some more more text. A error.

We have some natural language checking in lint.js:

var diff = require('unified-diff')
var vfile = require('to-vfile')
var unified = require('unified')
var markdown = require('remark-parse')
var stringify = require('remark-stringify')
var remark2retext = require('remark-retext')
var english = require('retext-english')
var repetition = require('retext-repeated-words')
var article = require('retext-indefinite-article')
var report = require('vfile-reporter')

vfile.read('readme.md', function(err, file) {
  if (err) throw err

  unified()
    .use(markdown)
    .use(
      remark2retext,
      unified()
        .use(english)
        .use(repetition)
        .use(article)
    )
    .use(stringify)
    .use(diff)
    .process(file, function(err) {
      console.error(report(err || file))
      process.exit(err || file.messages.length ? 1 : 0)
    })
})

lint.js is hooked up to run on Travis in .travis.yml like so:

# ...
script:
- npm test
- node lint.js
# ...

When run in Travis, we’ll see the following printed on stderr(4). Note that an an on L1 is not included because it’s unrelated to this PR.

readme.md
   3:6-3:15  warning  Expected `more` once, not twice   retext-repeated-words      retext-repeated-words
  3:22-3:23  warning  Use `An` before `error`, not `A`  retext-indefinite-article  retext-indefinite-article

⚠ 2 warnings

As there are messages, the build exits with 1, thus failing Travis. The user sees this and amends the PR to the following:

diff --git a/readme.md b/readme.md
index 360b225..5a96b86 100644
--- a/readme.md
+++ b/readme.md
@@ -1 +1,3 @@
 This is an an example.
+
+Some more text. An error.

This time our lint task exits successfully, even though L1 would normally emit an error, but it’s unrelated to the PR.

Ignore messages emitted by plugins before diff for lines that did not change.

There are no options. If there’s a TRAVIS_COMMIT_RANGE environment variable this plugin runs, otherwise it’s a noop.

See contributing.md in unifiedjs/unified for ways to get started.

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MIT © Titus Wormer